Regulation of Calcium on Peanut Photosynthesis Under Low Night Temperature Stress

The effects of different levels of CaCl2on photosynthesis under low night temperature(8°C)stress in peanuts were studied in order to find out the appropriate concentration of Ca2+through the artificial climate chamber potted culture test.The results indicated that Ca2+,by means of improving the stomatal conductivity of peanut leaves under low night temperature stress,may mitigate the decline of photosynthetic rate in the peanut leaves.The regulation with 15 mmol L-1CaCl2(Ca15)was the most effective,compared with other treatments.Subsequently,the improvement of Ca2+on peanut photosynthesis under low night temperature stress was validated further through spraying with Ca15,Ca2+chelator(ethylene glycol bis(2-aminoethyl)tetraacetic acid;EGTA)and calmodulin antagonists(trifluonerazine;TFP).And CaM(Ca2+-modulin)played an important role in the nutritional signal transduction for Ca2+mitigating photosynthesis limitations in peanuts under low night temperature stress.